<template>
  <div class="list" ref="wapper">
    <div><!--为了符合better-scroll的使用要求  github有要求  要加这个div-->
    <div class="area">
      <div class="title border-topbottom" >当前城市</div>
      <div class='button-list'>
        <div class="button-wrapper">
          <div class="button">{{this.currentCity}}</div>
        </div>
      </div>
    </div>
    <div class="area">
      <div class="title border-topbottom">热门城市</div>
      <div class='button-list'>
        <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
          <div class="button">{{item.name}}</div>
        </div>
      </div>
    </div>
        <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
          <div class="title border-topbottom">{{key}}</div>
            <div class="item-list"  >
              <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id" @click="handleCityClick(innerItem.name)">{{innerItem.name}}</div>
            </div>
        </div>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import {mapState,mapMutations} from 'vuex'
export default {
  name:'CityList',
  props:{
      hot:Array,
      cities:Object,
      letter:String
  },
  computed:{
//    ...mapState(['city'])   //意思是把Vuex里面的数据映射到组件的计算属性中，就是把city映射到组件名叫city的计算属性中，模板中直接用this.city就行了
    ...mapState({
      currentCity:'city' //意思是把Vuex里面的数据映射到组件的计算属性中，就是把city映射到组件名叫currentCity的计算属性中，模板中直接用this.currentCity就行了
    })
  },
  methods:{
    handleCityClick (city){
      //改变vuex中的status中的数据需要先调用active  但是调用active前需要调用dispatch
//      this.$store.commit('changeCity',city)   //...mapMutations(['changeCity'])之前
      this.changeCity(city)  //修改数据也可以直接通过mutations  只需要把dispatch换成commit
      this.$router.push('/')

    },
    ...mapMutations(['changeCity'])
  },
  mounted(){
      this.scroll = new BScroll(this.$refs.wapper,{click:true})
  },
  watch:{
    letter (){
      if(this.letter){
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element,300)
//        console.dir(this.scroll)

      }
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import "~styles/varibles.styl"
  .border-topbottom
    &:before
      border-color #ccc
    &:after
      border-color #ccc
  .border-bottom
    &:before
      border-color #ccc
  .list
    overflow hidden
    position absolute
    left: 0
    top: 1.58rem
    right: 0
    bottom: 0
    .title
      line-height: .54rem
      background #eee
      padding-left .2rem
      color #666
      font-size:.26rem
    .button-list
      padding .1rem .6rem .1rem .1rem
      overflow hidden
      .button-wrapper
        float left
        width: 33.33%
        .button
          margin: .1rem
          text-align: center
          padding .1rem 0
          border-radius .06rem
          border .02rem solid #ccc
    .item-list
      .item
        line-height: .76rem
        padding-left:.2rem
</style>
